nodejs in req.body empty question

With the express upgrade, bodyParser from express is separated out, therefore, when using the new version express the need npm install body-parser to install bodyParser.

1. In app.js to be introduced bodyParser.

   var bodyParser = require(‘body-parser‘);

2. Secondly, we need to use bodyParser in app.js in.

   app.use(bodyParser());

3. Finally, the need to provide parameters to bodyParser.

   ‘Content-Type‘: ‘application/x-www-form-urlencoded‘ 

   For the parameter bodyParser according to parse the file type to be provided, there are many types of parameters, can view the specific document.